Electric Storage Control System Converter Efficiency
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Solution Overview
Problem
Existing electric storage systems fail to optimize conversion efficiency across the entire system, including power converters, due to inefficient management of storage units and lack of consideration for converter efficiency, leading to reduced overall system performance.
Innovation Solution
A control system that connects multiple pairs of storage batteries and converters in parallel, featuring a charge and discharge total power decision unit and a power distribution unit to manage power distribution based on converter efficiency, ensuring that only efficient units are used for charging and discharging, thereby maintaining high output and reducing inefficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of electric storage units is increased to supplement power to the power system, then the power supply capacity is improved, but the conversion efficiency of power conversion devices deteriorates due to operation in low output regions
Solution Approach 1:
The control system dynamically adjusts the number of operating electric storage units based on the total charge and discharge power requirements. When total power demand is high, more units are activated; when demand is low, fewer units operate at higher individual output levels, avoiding inefficient low-output operation and maintaining optimal conversion efficiency across varying load conditions
Solution Approach 2:
The system changes the operational parameters by adjusting the output power distribution among electric storage units. By controlling each unit's output to remain above a predetermined threshold, the system ensures operation within efficient conversion regions while still meeting overall power supply requirements
2Reliability
If electric storage units are operated evenly to distribute wear, then battery lifespan is improved, but overall system efficiency deteriorates due to operation in low efficiency regions
Solution Approach 1:
The control system applies different operational strategies to different electric storage units based on system conditions. When total power demand allows, units are operated at higher individual output levels to maintain efficiency. The system selectively activates specific units rather than operating all units evenly, optimizing the balance between wear distribution and efficiency based on real-time power requirements
3Power
If multiple electric storage units are connected in parallel to increase capacity, then the power output capability is improved, but the conversion efficiency deteriorates due to low output per converter
Solution Approach 1:
The system dynamically determines the optimal number of electric storage units to activate based on the total charge and discharge power requirements. By adjusting the number of operating units in real-time, the system ensures that each active converter operates above a predetermined output threshold, maintaining high conversion efficiency while still achieving the required total power output capability
Data Source
AI summary
A control system for an electric storage system, in which a plurality of pairs of storage batteries and converters are connected in parallel to a power system, includes: a unit that decides charge and discharge of total power by the pairs of storage batteries and converters; and a unit that distributes the charge and discharge power decided by the charge and discharge power decision unit to the pairs of storage batteries and converters. The power distribution decision unit compares the charge and discharge total power with a limit output when conversion efficiency of the converters is equal to or greater than standard efficiency, and decides a running number by which an output of all the pairs of running storage batteries and converters is equal to or greater than the limit output when the charge and discharge total power is equal to or greater than the limit output.